Unifi bad service

before i purchase the unifi internet package , i was told that it’s faster than other internet communication.And when the first time i use unifi i found that it was fast and efficient. As i have a whole lot stuff to do but when i use for 1 month or maybe around 1 month,it went slower and slower.my things just cnt go as efficient as before.just then i heard that the staff in unifi company often take the advantage of us,the consumer,by using little Mb of our line and i goes like what! we paid for it and we just can’t use it worthly! i hope that unifi will improve on this thing thank you.